Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20020#discussion_r158198088
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -87,6 +87,51 @@ case class ExecutedCommandExec(cmd: RunnableCommand)
extends LeafExecNode {
}
}
+/**
+ * A physical operator that executes the run method of a `RunnableCommand`
and
+ * saves the result to prevent multiple executions.
+ *
+ * @param cmd the `RunnableCommand` this operator will run.
--- End diff --
`DataWritingCommand` is not a `RunnableCommand`.
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